This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 11 |
| 5 | 34 |
| 6 | 2136 |
| 7 | 7013320 |
| 8 | 29281354514767168 |
| 9 | 234431745534048922731115555415680 |
| 10 | 1994324729203114587259985605157804740271034553359179870979936357974016 |